The Modern JavaScript Bootcamp (2019) - Digging Into Prototypical Inheritance

The video tutorial explores JavaScript's prototypal inheritance, focusing on how constructor functions and prototype properties work. It explains the prototype chain, how instances link to shared methods, and the impact of modifying prototypes. The tutorial also covers property shadowing and the practical implications of prototypal inheritance, providing code examples to illustrate these concepts.

What is the primary purpose of the prototype property in JavaScript?

• To manage memory allocation

• To link instances to shared methods

• To store instance-specific data

• To define private variables

How does JavaScript determine which property to access when a method is called on an instance?

• It checks the global scope first

• It randomly selects a property

• It looks for the property on the instance, then follows the prototype chain

• It only checks the prototype chain

What is the result of accessing a non-existent property on an instance?

• The program crashes

• An error is thrown

• A default value is used

• Undefined is returned

What happens when a prototype property is changed after an instance is created?

• The change causes an error

• All instances reflect the change

• Only new instances reflect the change

• The change is not reflected in existing instances

In JavaScript, what is property shadowing?

• When an instance property overrides a prototype property

• When a global variable is hidden by a local variable

• When a property is duplicated in the same object

• When a method is hidden by another method

Why is it important to understand prototypal inheritance in JavaScript?

• To avoid unexpected behavior in applications

• To improve memory management

• To write faster code

• To simplify syntax

How does JavaScript handle method calls on strings?

• Strings are treated as objects with methods

• Methods are not allowed on strings

• Methods are directly attached to string literals

• Strings are converted to arrays